v3.26.3
Equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Loss Roll Forward                
Beginning balance $ (205.6) $ (331.6)            
Other comprehensive income (loss) before reclassifications (41.1) 115.7            
Amounts reclassified from accumulated other comprehensive loss 1.7 2.9            
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax 3.7              
Net curtailment and settlement losses (3.7)              
Tax expense (0.5) (1.4)            
Ending balance (241.8) (214.4)            
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 2,172.4 1,946.6 $ 2,118.6 $ 2,101.2 $ 2,067.6 $ 1,786.5 $ 1,606.9 $ 1,500.7
Defined benefit items                
Accumulated Other Comprehensive Loss Roll Forward                
Other comprehensive income (loss) before reclassifications 3.3 (4.7)            
Amounts reclassified from accumulated other comprehensive loss 1.7 3.4            
Net curtailment and settlement losses 3.7              
Tax expense (0.1) (1.8)            
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (116.3) (126.2)     (124.9)     (123.1)
Foreign currency items                
Accumulated Other Comprehensive Loss Roll Forward                
Other comprehensive income (loss) before reclassifications (45.6) 122.1            
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0            
Net curtailment and settlement losses 0.0              
Tax expense 0.0 0.0            
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (130.8) (93.3)     (85.2)     (215.4)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest                
Accumulated Other Comprehensive Loss Roll Forward                
Other comprehensive income (loss) before reclassifications 1.2 (1.7)            
Amounts reclassified from accumulated other comprehensive loss 0.0 (0.5)            
Net curtailment and settlement losses 0.0              
Tax expense (0.4) 0.4            
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 5.3 $ 5.1     $ 4.5     $ 6.9